Mike, Welcome, I'm new too but only to this website, I've had PN for 11 years and mine had a fast onset also like yours. Sorry you have to be here...

It started in my left foot arch and then my right foot, was burning and tingling and it took a few years before I knew what caused this, we think it's from a sugar problem that isn't bad enough to show up on most diabetes tests. It's called impaired glucose tolerance and I finally had a test read that showed it.

My B12 was in the 300s so I have been taking 1000mg of methylcobalamine lozenges and now it's in the 800s. I take Prilosec and have taken other antiacids for my hietal hernia, which can cause low absorption of B12, I think.

I have been able to control my sugar levels with my diet, exercise, and medication. Also, Mike, I was able to work to retirement, I won't say there was no pain but meds help me with that and retirement has helped too! I want to encourage you that there can be life after you figure out your cause and work on it and medications and supplements (I take those too) with your Dr. and friends and family!